Magneto ignition apparatus.



l c.. M. P. MONTBARBON.

MAGNETO IGNITION APPARATUS. A'PPLxoATmn FILED. Dnc. 11, 1903.

Pateta 11:11:29, 1910.

-terposed in this merrain estaras Parana onirica.

'CHARLES MAURICE PHILIPPE IVIONTBARBON, OF PARIS, FRANCE.

MAGNETO IGNITION APPARATUS.

Specification of Letters Patent. Application ledecember 11. 1988.

rtl-tenten Mar. 29, 191e. Serial N0. 462,113. I

In order to reduce the size of ignitionV apparatus consisting of a separate magneto and coil, attempts have been made to place i is'A interposed between two elements of the Apparatus. which iml' tric is placed on f tric is placed on each the coil in the space between the cover of the armature and the arch formed by the magnets. If however the coilI be merely placed in this position without any special modications, the secondary windingcan only generate a very weak current. This is due to the fact that 'the coil when so situated is surrounded by a conducting circuit of large cross section and low resistance, viz.

tliecircuit formed by the assemblage of the magnets, the pole pieces,` the base and the cover ofthe magnets.

erated in the soft iron altered by the sudden making or breaking of the current from the magneto in the primary winding of the coil, there is then produced: l, a secondary current in the secondary winding of the coil; current in the conducting circuit of low resistance above mentioned. This second core of the coil is Then the iiux, gen- I 2, another secondary currentiiows through a circuit of little or no resistance and generates in the soft iron core of the coil atlux opposite to the linx produced by the primary winding of the coil and'nearly equal vto it. The secondary current generatedin the secondary winding of the coil, is thus only due to the difference of the variationsoi.2 flux in the soft iron core. This explains the failure of the experiments undertaken with this object.

This invention has for itsobject an ar rangement in which the coil can be placed as above indicated without any loss of power resulting.

the secondary currents flow. The break or breaks are'preferably madeby interposing a suitable dielectric at one or more points of the circuit.. The layer of dielectric incircuit should be as thin as resistivity circuit in question and it may project where necessary inorder to make certain that current cannot pass. In oi'der to hold the magnets in position, two methods among others may be employed. `When the layer of dielecone side only for example, thevotlier pole of the magnet may be fixed on the other side to the pole piece by means of a screw. vWhen a layer of dielecf side of the pole pieces the distance between the poles is made smaller than the pole pieces in such a man# ner that when in position the poles grip the dielectrics and hold themselves in position.

. Any suitable dielectric may be employed but be one of great .electric preferably it vshould so that it may be thin. Good results` are obtained with mica in leavesless than one 4tenth of amillimeter thick, so as to avoid lossesl caused by too large a gap 4 in the metal.

The accompanying drawing illustrates a magneto frame constructed in accordance with this invention.

Between the limb a1 of the magnetand the assemblage formed of the correspondiiio' pole pieces b1 b2, the cover c and the base 'is placed a layer of dielectric e ,completely insulating the pole al from the neighboring parts. The dielectric is held in place by the lelasticity or resiliency of the magnet limbs, the other limb a of the said limb being fixed tothe pole piece b2 by means of a The coil f is placed in the space g above the cover c.

Having now particularly described and ascertained the nature and in what manner the same is to be performed, .I declare that what I claim is:

l. A magneto-generator magnet substantially closed as a magnetic circuit but broken as an electric circuit, in combination with an induction coil varranged on the inside of said magnetic circuit.4 vIt consists in lbreaking at 'one or more l places this electric circuit through which possible consistent with' the effective interiuption of the permit the same to serve effectively as' a inagi'ieticcircuit. -In practice the dielectric electric current, in order to f 2. A. magneto-generator magnet comprising an arch and an armature cover, in combination with an induction coil arranlrfl within the arch, the electric circuit formed by the arch and the cover being electrically interrupted. 4.

' 3. A magneto-generator magnet comprising an arch and an armature cover, in combination with an induction coil arranged within the arch, a break bei ig the electric circuit formed by the arch and formed in of my said invention .1. the cover, a dielectric being arranged in said l break.

4. A magneto-generator magnet comprising an arch and limbs, pole-pieces extendin from the limbs, an armature cover and a l(base, in combination with an induction coil arranged Within the arch, and a dielectric layer inserted between a limb and the adjacent parts.

5. A magneto-generator magnet comprisfrom the limbs, an armature cover and a base, in combination with an induction coll arranged Within the aren, and a dlelectric fing an arch and limbs, pole-pieces extending 5 gneto-generator magnet comprising ple-pieces and resilient llmbs, in com-A bination with a dielectric held between one of said limbs and the adjacent pole-piece by the resiliency of the limbs. In testimony Whereofl have signed this specification in the presence of two subscribing witnesses. 4

i CHARLES MURCE PHILIPPE MONTBRBON,

Witnesses: l

DEAN B. MASON, FRDRIC HARL. 

